rooster tail
06-25-2010, 05:09 PM
#21
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OK, getting back to the OP's question, a big rooster tail might - and might not - be a bad thing. You can generally throw a pretty big rooster just by over trimming a boat. That would be very inefficient - and tough on the u-joints too.
You can also throw a big rooster tail in a boat where the prop shaft is closer to the surface of the water. (That's that "x-dimension" thing they're talking about.) Generally speaking, raising the propshaft height relative to the planing bottom reduces drag on the gearcase and thus increases speed. You also get a free rooster tail. In my experience though, unless your drive is mounted really low or you're going over about 75 MPH, raising the drive up doesn't do much.
How do I know all this? I run an outboard and have for years. I also run mine with a jack plate - which allows me to alter my x-dimension at will. I currently run my Diamond Marine modified Mercury 200 well up the jack plate / transom. My hole shot stinks, but top end is quite nice and a huge rooster - even at zero trim - comes with it for free.
Hope that helps.
You can also throw a big rooster tail in a boat where the prop shaft is closer to the surface of the water. (That's that "x-dimension" thing they're talking about.) Generally speaking, raising the propshaft height relative to the planing bottom reduces drag on the gearcase and thus increases speed. You also get a free rooster tail. In my experience though, unless your drive is mounted really low or you're going over about 75 MPH, raising the drive up doesn't do much.
How do I know all this? I run an outboard and have for years. I also run mine with a jack plate - which allows me to alter my x-dimension at will. I currently run my Diamond Marine modified Mercury 200 well up the jack plate / transom. My hole shot stinks, but top end is quite nice and a huge rooster - even at zero trim - comes with it for free.
Hope that helps.
06-25-2010, 11:27 PM
#22
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06-25-2010, 11:32 PM
#23
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okay i know that i am the "little guy" but i need to know what makes a boat rooster tail cause some day i need that . heres the thing was running the boat on the lake and came across a 30 to 33 foot something was not a cig ,fountain or anything common but had twin engines and yes he walked me but this was not a 100 mph boat he was low seventies tops , but had a giant rooster tail . i understand that trim is what makes the rooster tail but i can trim all i want and never get a rooster tail . is it a twin engine thing or is it a hull thing also i understand that certain props ride higher in the water which i would think would cause a rooster tail . lastly in the future i need a 35 lightning with twin 600's or 525's would this boat"rooster" .
p.s. yes i am a dork
p.s. yes i am a dork
Do you want to finish first, or look like you could have???
06-26-2010, 05:12 PM
#24
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06-27-2010, 04:09 PM
#26
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I've got a 35 at the shop right now with a pair of 1050's and shorty XR's with six blades. It throws a roost and drives at the same time.. 
We'll see how it does with SCX's.
Here's a 36 supercat with #6's
http://www.youtube.com/watch?v=ao3v9MXwEHo
We'll see how it does with SCX's.Here's a 36 supercat with #6's
http://www.youtube.com/watch?v=ao3v9MXwEHo
07-02-2010, 11:55 PM
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07-03-2010, 08:27 PM
#28
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07-10-2010, 02:38 PM
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Pretty tough to tell with just a glance, nice one! I would love to have a pair of arn's for sure. Think I will wait till I get a new boat. I have mine for sale now think I need somthing a bit bigger for Lake Superior than a 30 footer. Might go with a vee but it will have to be nice, really nice. I can only imagine that the new technology offerd by you is the way to go, as the old Kaama I run seems to do quite well and is old and heavy. Had my first scare last weekend Lost a fuel pump in a hard turn @wot. a little like an 8000 lb pinball! Made it out fine and repaired it to go on sunday agian. Oh yea it was a huge rooster when the other sponson planted.
10-19-2010, 05:20 PM
#30
Plate was below the boat, and plowing through the water, now plate does not touch at speed.
HUGE improvement, no downside, great rooster tail as well!
